Process for impregnating ceramic and other porous objects.



To all whom it may concern unrrnn snares rn rnnr ora ion 1 MAXGRfi'NZWEIG, 0F LUDWIGSHAFEN-ON-THE-RHINE GERMANY.

' PROCESS ron IMPREGNATYING CERAMIC AND OTHER ronous cleaners.

No Drawing.

'Be it known that I, IAX

ful Improvements in Processes for Impregnating Ceramic and other PorousQbjects, of Which the following is a specification.

This invention relates to a process primarily intended to protectceramic products 'from damp. The process may be applied too to othermaterials and the materials may be-protected against other bodies thanWater.

' Hitherto for this purpose ceramic objects have either been glazed orsoaked in liquid solutions of pitch, resin or the like, the superfluoussolvent being afterward removed by drying in the air or at a hightemperature. But this method causes the objects so treated to increasein weight and (let creases more or less the pores of the material.

The present invention consists in subjecting, the objects to the hotvapors of the products of distillation or organic bodies, which can becalled collectively higher hydrocarbons even if strictly speaking theycannot all be grouped underthis heading owing to the fact that theirconstitutionhas not.

been determined. In this manner the walls of the pores are covered witha IHICYOSCOPL cally thin skin, which prevents the imbibition of moisturewithout considerably increasing the Weight or decreasing the porosity.

The process is carried out in a very simple manner. If tar is used, forexample, the

objects to be treated are introduced into a 2 bone produced by thedistillation of organic plete impregnation is required or not. The 7time may be less than an hour or it may extend over several hours. hentar is used the objects treated assume a darker Specification of LettersPatent;

Application filed May'28. 1908. Serial No. 435,540,

GRiiNzwnIo, sta dent of chemistry, a subject of the German Patented Jan,as, rare.

tone and increase? about 2 per cent. in Weight. This impregnationcanunder certam circumstances be combined with the burning of the ceramicobject, the impregnatmg material being led into the kiln durmg thecoohng stage, the temperature being that suitable for vaporization.

Now what I claim and desire to secure bv Letters Patent ,is thefollowing: v

1. Process for producing a microscopically thin skin on the Walls of thepores of ceramic objects and the like and thereby aterproofing saidobjects, consisting insubecting the articles to be treated to hot vaporsof the higher hydrocarbons produced by distillation of organic bodies ata temperature below the point of decomposition of the vapors. j

2. Process for forming amicroscopically thin skin Ion the alls-of theports of ceramic objects and thereby Waterproofing the objects,consisting in subjecting the objects to hot vapors of tar at atemperature below the point of decomposition of the vapor.

3. Process offorming a microscopically thin skin on the walls of thepores of ceramic ob ects and thereby waterproofing the" same, consistingin subjecting the objects to hot vapors of the higher hydrocarbonsproduced by distillation of, organic bodies at a temperature below thepoint of decomposition of the vapors, the said vap'ors being produced byintroducing the impregnating material into the kiln during thecoolingstage.

4-. Process of producing a microscopically thin skin on the Walls of thepores of. ceramic obj ectsand thereby Waterproofing the objects,consisting in subjecting the objects to the hot vapors of the higherhydrocarbodies at a temperature below the point'of decomposition of thevapors, thereby precipitating the said vapors in undecomposed form onthe'Walls of thepores. i j

5. The herein described process of PIOf viding porous ceramic articleswith a moisture repellent coating, which consists in subjecting saidarticles to the action of hot vapors produced by the distillation oforganic bodies at a temperaturebelow the point of decomposition of suchvapors,

wheraby there is praciuceci upon 4311a cell Walls 01? Such articles afilm consisting of cfistilled hydrocarbons in contradistinction to freeGarb en, ,azmi which film does not ma 5 tez 'ially increase the weightof the articles or destroy their porous nature.

claim the foregoing In testimony, that I as my invention, I have signedmy name in presence of two Witnesses, this sixteenth day of May 1908. HGRUNZWEIGm Witnesses CARL MEssER,

Jo. H. LE'UTE:

